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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0388972f717c5137a0432ccdcb71c407604851b764ac8fec92cd7ba2f084fe0d' 
  AND token = 'fzMukHaD3ynFR29r6KQeDhcc9d7ZwWlV5TWVxkV95xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}